Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...139..375a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 139, no. 2, Oct. 1984, p. 375-377.
Astronomy and Astrophysics
Astronomy
7
Accretion Disks, Black Holes (Astronomy), Cyclotron Radiation, X Ray Sources, Binary Stars, Compton Effect
Scientific paper
Cyclotron emission in the inner regions of an accretion disk around a matter accreting black hole can be appreciable. In the case of the X-ray source Cyg X-1, cyclotron emission may provide the soft photons needed for "Comptonization" to produce high energy X-rays. The inverse correlation between the fluxes of high energy and low energy X-rays during the "high" and "low" states of Cyg X-1, may be understood as a result of the variation of the rate of accretion and the Compton scattering of the cyclotron photons. In the case of the X-ray source GX 339-4, the observed optical flux during the high states does not seem to be due to cyclotron emission, but probably due to reprocessing of high energy X-rays by the outer regions of the disk.
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